Lasing in a Slow Plasmon Moiré Cavity

We report on lasing from dye-based excitons coupled to slow plasmon states inside metallic Moire cavities. Surface plasmon polaritons (SPPs) inside the cavity were slowed down to a maximum group velocity of 0.3c. Varying the modulation of the Moire cavity, we tune the output wavelength of the plasmonic laser by varying the fast modulation period of the Moire cavity. This work opens a new way to study SPP–matter interaction dynamics and plasmonic lasing with Bragg cavity confined slow plasmons.